#include <bits/stdc++.h>
using namespace std;

using Int = long long;
const char newl = '\n';

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}
template<typename T=int>
vector<T> read(size_t n){
  vector<T> ts(n);
  for(size_t i=0;i<n;i++) cin>>ts[i];
  return ts;
}

//INSERT ABOVE HERE
using P = pair<int, int>;
P pos(int x){
  int r=0,c=0;
  while(x%2==0) r++,x/=2;
  while(x%5==0) c++,x/=5;
  return P(r,c);
}

int val(int r,int c){
  int x=1;
  for(int i=0;i<r;i++) x*=2;
  for(int j=0;j<c;j++) x*=5;
  return x;
}

signed main(){

  int x1,x2;
  cin>>x1>>x2;

  while(1){
    auto [r1,c1]=pos(x1);
    auto [r2,c2]=pos(x2);

    int ddr=0,ddc=0;
    if(abs(r2-r1)>abs(c2-c1)){
      ddr=(r2-r1)/abs(r2-r1);
    }else{
      ddc=(c2-c1)/abs(c2-c1);
    }

    int nr=r1+ddr,nc=c1+ddc;
    x1=val(nr,nc);
    cout<<x1<<endl;
    if(x1==x2) return 0;

    cin>>x2;
    if(x1==x2) return 0;
  }

  return 0;
}